Why does sinus drainage irritate vocal cords?

Sinus drainage can irritate the vocal cords because of several reasons:

Mucus Overproduction: When sinuses are inflamed or infected, they produce excessive mucus. This thick mucus can drip down the back of the throat (post-nasal drip) and cause irritation to the vocal cords.

Inflammation: Sinus infections and inflammation can lead to swelling and redness of the tissues surrounding the vocal cords, including the vocal folds themselves. This inflammation can cause the vocal cords to become irritated, making them more sensitive and prone to vocal strain.

Acid Reflux: Sinus drainage can sometimes trigger acid reflux, where stomach acid backs up into the esophagus and throat. Acid reflux causes a burning sensation and irritation in the throat, which can extend to the vocal cords and cause further irritation.

Coughing and Clearing Throat: Post-nasal drip can induce a persistent urge to cough or clear the throat. Frequent coughing and throat clearing can put strain on the vocal cords, leading to irritation.

Dehydration: Sinus drainage and infections can cause dehydration, which leads to dryness in the throat and vocal cords. Dry vocal cords are more susceptible to irritation and inflammation.

Altered Vocal Quality: Sinus issues can cause changes in vocal quality, including hoarseness, reduced vocal range, and vocal fatigue. These changes occur due to the irritation and swelling of the vocal cords.